Ken D. Kumayama

Ken D. Kumayama

Partner, Intellectual Property and Technology; Cybersecurity and Data Privacy; Artificial Intelligence
Ken Kumayama concentrates his practice on transactional matters in intellectual property and technology and privacy.


The Daily Journal has recognized Mr. Kumayama several times as one of the leading technology lawyers in California, including as a 2024 and 2023 Top Intellectual Property Lawyer, 2022 Top Cybersecurity Lawyer and previously as one of the state’s Top Artificial Intelligence Lawyers. He also was honored as a 2023 Technology MVP by Law360 and has been selected as one of Lawdragon’s 100 Leading AI & Legal Tech Advisors, in addition to being named to Chambers USA and The Best Lawyers in America. He was a key member of the deal teams that received California Lawyer Attorneys of the Year (CLAY) Awards in recognition of innovative work on behalf of: Livongo Health in its $18.5 billion acquisition by Teladoc Health (2021), Intel Corporation in its $15.3 billion acquisition of Mobileye, N.V. (2018) and Broadcom Corporation in its $37 billion acquisition by Avago Technologies (2016).

He represents clients in a range of technology and commercial transactions relating to the ownership, protection and exploitation of intellectual property, including IP monetization strategies, development and license agreements, co-development agreements, pharmaceutical collaboration agreements, patent and other technology license agreements, trademark and copyright license agreements, and patent and other intellectual property asset sales and acquisitions. He also counsels clients in a broad range of industries, such as in adtech, fintech and digital health, on cybersecurity- and privacy-related matters, including with respect to the California Consumer Privacy Act, Gramm-Leach-Bliley Act, data rights, and artificial intelligence and machine learning.

In addition to his transactional work, Mr. Kumayama has experience in many other types of patent- and IP-related matters, including investigating and rendering freedom-to-operate, validity and non-infringement opinions; engaging in patent landscape analyses and assessing patent infringement risk; evaluating the strength of, and encumbrances on, patent portfolios; and counseling clients on patent and other strategic IP issues. He is a thought leader in patent analytics and regularly presents on the topic. He also regularly speaks on topics such as patent acquisition and M&A due diligence. Mr. Kumayama’s pre-law studies, academic research and job experience included theoretical chemistry, geophysics, bioinformatics and system administration of a Linux network, requiring a comprehensive knowledge of mathematics, computer programming (including in C++, perl and FORTRAN) and the sciences. He is fluent in Japanese and worked for more than four years in Japan, both as an attorney at a Japanese law firm and for a Japanese company. He has written about patent monetization and Internet privacy issues and has spoken, in Japanese and English, on topics such as trends in e-discovery and patent exhaustion.

Mr. Kumayama serves as the co-head of the Palo Alto Hiring Committee.

Significant matters in which Mr. Kumayama has been involved include:


  • Entegris, Inc. in its $6.5 billion acquisition of CMC Materials, Inc.
  • Intel Corporation in its $15.3 billion acquisition of Mobileye, N.V.; its $4.2 billion spin-off and joint venture with TPG Capital, L.P. to form the independent cybersecurity company McAfee; its spin-off of its Wind River subsidiary to TPG Capital, L.P.; its sale of a majority of its smartphone business to Apple for $1 billion; and its sale of its home gateway platform division to MaxLinear, Inc.
  • Coherent in its initially announced $5.7 billion sale to Lumentum, followed by Coherent’s subsequent responses to competing acquisition proposals from MKS Instruments, II-VI and Lumentum in a three-party bidding war culminating in Coherent’s $7.1 billion sale to II-VI
  • NXP Semiconductors N.V. in its $1.76 billion acquisition of Marvell Technology Group Ltd.’s Wi-Fi and Bluetooth connectivity assets
  • Broadcom in numerous transactions, including its $37 billion sale to Avago Technologies Ltd.; its $164 million acquisition of the wireless modem business of Renesas Electronics Corp.; its $195 million acquisition of BroadLight, Inc.; its $3.7 billion acquisition of NetLogic Microsystems, Inc.; its acquisition of Bay Dynamics, Inc.; and in various inbound and outbound technology license agreements
  • Xilinx, Inc. in its $49 billion acquisition by Advanced Micro Devices, Inc.
  • Xperi Corporation in its $3 billion merger of equals with TiVo Corporation and Tessera Technologies, Inc. (now Xperi) in its $850 million acquisition of DTS, Inc.
  • Western Digital Corporation in its data storage and solutions joint venture with Unisplendour Corporation Limited to market and sell Western Digital’s datacenter storage systems in China
  • Advantest America, Inc. in its collaboration with PDF Solutions, Inc.
  • Cavium, Inc. in its $1.4 billion acquisition of QLogic Corp. and its $6 billion acquisition by Marvell Technology Group Ltd.
  • Cadence Design Systems Inc. in its $170 million acquisition of Jasper Design Automation, Inc.


  • Activision Blizzard Inc. in its $75 billion acquisition by Microsoft Corporation
  • Elon Musk in his $44 billion acquisition of Twitter, Inc.
  • Embracer Group AB in its acquisitions of Dark Horse Media, LLC and Middle-earth Enterprises
  • Dell Technologies Inc. in its $4 billion sale of Boomi to Francisco Partners and TPG
  • Scopely, Inc. in its $1 billion acquisition of GSN Games, Inc. from Game Show Network, LLC
  • Square Enix Holdings Co., Ltd. in the $300 million sale of Crystal Dynamics, Inc., Eidos Interactive Corp. and an IP catalogue to Embracer Group AB
  • Sabre Corporation in its sale of the AirCentre suite of flight and crew management software solutions to CAE Inc. for $392.5 million
  • Zayo Group Holdings, Inc. in several matters, including its $14.3 billion acquisition by affiliates of Digital Colony Partners and the EQT Infrastructure IV fund, the largest media and communications leveraged buyout since the 2008 financial crisis; and its sale of zColo, including certain U.S. and European data center assets, to DataBank Holdings, Ltd.
  • Netflix, Inc. in its acquisitions of Animal Logic, The Roald Dahl Story Company Limited and Scanline VFX
  • Proofpoint in its $12.3 billion sale to Thoma Bravo
  • Honeywell in its $1.3 billion acquisition of Sparta Systems from New Mountain Capital
  • Airbnb, Inc. in its acquisition of HotelTonight, Inc.
  • DoorDash in its $410 million acquisition of Caviar from Square
  • Silver Lake Partners in its acquisition of a majority stake in ServiceMax, Inc. from GE Digital LLC
  • F5 Networks, Inc. in its $1 billion acquisition of Shape Security, Inc.
  • Didi Chuxing (Hangzhou Kuaizhi Technology Co., Ltd.) (China) in a strategic software license agreement, and in its acquisition of UberChina from Uber Technologies Inc. The UberChina transaction was named one of China Business Law Journal’s 2016 Deals of the Year
  • Bytedance Ltd. in several matters, including its acquisitions of and Moonton, and private equity financings valued at over $20 billion
  • Apex Technology Co., Ltd. in its $4 billion acquisition of Lexmark International Inc.
  • Samsung Electronics Co., Ltd. in its acquisition of LoopPay, Inc., a mobile payments company
  • XIO Group (Hong Kong) in its $1.1 billion acquisition of J.D. Power and Associates, Inc. from McGraw Hill Financial, Inc.
  • Carbonite in its $1.45 billion sale to OpenText and its $618.5 million acquisition of Webroot
  • Permira Funds in several transactions, including the acquisition and subsequent $1.1 billion sale of its portfolio company Renaissance Learning to Hellman & Friedman; and its significant investment in Curriculum Associates from Berkshire Partners
  • NDS Group Ltd. and its owners, Permira Funds and News Corp., in its $5 billion sale to Cisco Systems, Inc.

Life Sciences

  • Livongo Health in its $18.5 billion sale to Teladoc
  • Stryker Corp. in its:
    • $3 billion acquisition of Vocera Communications, Inc.
    • $4 billion acquisition of Wright Medical Group
  • Alder BioPharmaceuticals Inc. in its sale to Lundbeck for up to $1.95 billion
  • Array BioPharma, Inc. in its $11.4 billion sale to Pfizer
  • Danaher Corporation in the carve-out of its dental supplies unit into a separate publicly traded company called Envista Holdings Corporation via a $589 million initial public offering of common stock
  • Otsuka Pharmaceutical Co., Ltd. in its $430 million acquisition of Visterra, Inc.
  • Ares Life Sciences, a health care-focused private equity fund, in several potential acquisitions
  • Protalix BioTherapeutics in the sale of its Gaucher disease treatment Elelyso to Pfizer
  • Nitto Denko Corporation in its sale of Aveva Drug Delivery Systems

Fintech & Financial Services

  • Credit Karma in its $8.1 billion acquisition by Intuit and its $50 million divestiture of its tax business, Credit Karma Tax, to Square, Inc.
  • LendingClub Corporation in connection with its acquisition of a national bank and transition to become a bank holding company
  • ZhongAn International in its insurtech joint venture with SoftBank Vision Fund
  • PayPal Holdings, Inc. in multiple transactions, including its $4 billion acquisition of Honey Science Corporation, its $750 million strategic investment in MercadoLibre and its acquisitions of Jetlore, Inc., Hyperwallet and iZettle
  • Visa Inc. in connection with its equity interest in, and contractual relationship with, Prisma Medios de Pago S.A., the leading cards and payments company in Argentina; and its proposed but terminated $5.3 billion acquisition of Plaid Inc.
  • JPMC in connection with its divestiture of the Quorum blockchain platform to ConsenSys and associated agreements
  •, Inc. in the spin-off of its 68.6% stake in its finance business, JD Finance, and in its Thai e-commerce joint venture with Central Group
  • Citibank in the sale of its consumer banking and credit card businesses through international auction processes to: Banco Santander Rio S.A. in Argentina; Itaú Unibanco Holding S.A. in Brazil; Scotiabank in Panama and Costa Rica; Promerica Financial Corporation in Guatemala; Banco Ficohsa in Nicaragua; Terra Group in El Salvador; and Banco Colpatria and Bank of Nova Scotia in Colombia

Strategic Patent Transactions and Counseling

  • Nokia Corporation in multiple transactions, including the settlement of its global patent litigation with Apple for $2 billion and the $7.2 billion sale of its devices and services business to Microsoft Corporation
  • RPX in multiple transactions, including its acquisition of patent assets from Rockstar Consortium US LP for $900 million, its acquisition by HGGC for $555 million, and its negotiations with the Japanese patent fund IP Bridge in a syndicated licensing transaction involving 10 member licensees
  • a public semiconductor company in a portfolio-wide cross-license with another public semiconductor company
  • an internet of things consumer products company in multiple transactions, including the licensing, acquisition and monetization of patents and technology
  • IPXI in connection with certain structuring matters and a ULR patent license exchange offering
  • MIPS Technologies, Inc. in the concurrent sale of patents to an entity formed by the defensive patent aggregator Allied Security Trust and its acquisition by Imagination Technologies Group plc for aggregate consideration of $450 million. The acquisition was named among the top matters in the Lawyers to the Innovators category in the Financial Times’ 2013 U.S. Innovative Lawyers report

Data Privacy and Cybersecurity Counseling

  • Assisting clients across various industries with their California Consumer Privacy Act (CCPA) and Gramm-Leach-Bliley Act (GLBA) compliance programs, including advising on privacy policies and procedures, anonymization and de-identification of personal information, privacy-by-design, security-by-design and other best practices
  • Drafting, negotiating and advising on data processing, data sharing and data transfer provisions and agreements, including in connection with customer and vendor agreements and in the context of machine learning training data sets
  • Advising clients in connection with adtech, direct marketing and online behavioral advertising
  • Assessing and advising on data privacy and cybersecurity issues with respect to complex, cross-border corporate transactions



  • J.D., University of Arizona College of Law, 2009 (summa cum laude; Order of the Coif; Arizona Law Review)
  • B.A., Northwestern University (Integrated Sciences and Mathematics), 2001


  • California
  • U.S. Patent and Trademark Office


  • Japanese

Ken D. Kumayama

Partner, Intellectual Property and Technology; Cybersecurity and Data Privacy; Artificial Intelligence